500kV交流输电线路绝缘子并联间隙电弧运动特性  

Research of Arc Movement on Parallel Gap for Lightning Protection Used in 500kV AC Transmission Line

作　　者：许衡[1] 彭波[2] 姜文东[3] 赵淳[1] 苏杰[1] 任华[1] 段炼[4] 张波[4] 何金良[4] 

机构地区：[1]南瑞集团公司(国网电力科学研究院),江苏省南京市211106 [2]国家电网公司,北京市西城区100031 [3]国网浙江省电力公司,浙江省杭州市310007 [4]电力系统及发电设备控制和仿真国家重点实验室(清华大学电机系),北京市海淀区100084

出　　处：《电网技术》2017年第11期3713-3720,共8页Power System Technology

基　　金：国家电网公司科技指南项目(5211JH1500X7)~~

摘　　要：绝缘子并联间隙是输电线路雷电防护的有效手段之一。文章对500kV线路所用并联间隙的设计参数及其对电弧运动的影响进行了全面的研究。建立了绝缘子并联间隙的电弧运动仿真模型,通过仿真计算,研究了上下并联间隙的罩入比、罩入深度、尺寸以及短路电流对并联间隙间电弧运动情况的影响,详细分析了电弧所受的间隙磁场力、同侧导线磁场力和异侧导线磁场力的特征。仿真结果表明,上间隙电极的弯折角度不应过大,采用上下罩入深度比例2:1的设计,保证起弧点远离绝缘子,同时还防止了电弧上弧根在上间隙弯折处向绝缘子方向运动,绝缘子裸露空气部分85%。推荐并联间隙上下导体水平布置且端部距离绝缘子水平距离为700mm/700mm宽度的设计尺寸。Parallel gap for lightning protection（PGLP） is an effective method.Designing parameters of PGLP and their influence on arc movement were studied.A PGLP used for 500 kV transmission line was modeled and its arc movement was simulated.Influence of different shielding rations,shielding depths,dimensions,and arcing currents on magnetic force and arc movement was studied.With transmission lines on the same side of the PGLP and on the other side,characteristics of magnetic force produced by arc and PGLP were analyzed.According to the research result,upper arc root was prone to jump onto PGLP conductors.Thus the PGLP should be designed as horizontal.Lower PGLP conductor should be bent upward to keep 85% of the insulator exposed.Distance from gap end to the insulator was recommended as 700 mm/700 mm.

关 键 词：500kV线路防雷 并联间隙 电弧运动 电弧链式模型 

分 类 号：TM86[电气工程—高电压与绝缘技术]